Open-source generative VFX for ComfyUI. LTX-2.3 invents the effect; PlateLock composites it onto your original footage like a VFX artist would — so every pixel the effect doesn't need stays bit-identical to what you shot.
Built for #OpenSourceHiggsfield · 100% open weights · LTX-2.3 · ComfyUI custom node pack · Comfy SDK app · MIT
▶ Demo video (1:58): YouTube · mp4 · Live gallery: https://tushartechs.github.io/platelock/
Higgsfield's most popular product is its VFX library — explosions, portals, transformations. Every tool like it (open or closed) works the same way: the model repaints the entire frame. Even pixels the effect never touches come back changed:
- faces and textures drift, fine detail turns to mush
- the background shimmers frame to frame (VAE noise)
- 1080p/4K footage comes back at the model's resolution
- colours shift slightly — enough to ruin a cut against the untouched shot
That's fine for a meme. It's unusable for anyone who needs the shot to stay their shot.
A compositor never re-renders the actor. They generate the element, pull a matte, and layer it over the original plate. PlateLock does exactly that, automatically, inside ComfyUI:
| Raw generative edit | PlateLock | |
|---|---|---|
| Pixels outside the effect | regenerated (~25 dB PSNR) | copied bit-for-bit (lossless) |
| Output resolution | model resolution (1024×576) | your footage's resolution |
| Background shimmer / colour drift | yes | none |
| Sensor grain on the effect | none (plastic look) | matched to your camera |
| Reusable in Nuke / AE / Resolve | no | alpha + emissive element, X-ray matte |
| Proof | trust me | Fidelity Report node measures it |
| Shot | Prompt | Raw LTX, outside effect | PlateLock: bit-identical |
|---|---|---|---|
| 🔮 Energy Orb | Add a glowing golden orb of swirling energy with crackling sparks, floating just above the open palm. | 35.6 dB | 89.2% (lossless) |
| 🔥 My Code Is On Fire | Add roaring orange flames with drifting embers, burning on the laptop keyboard. | 33.3 dB | 92.0% (lossless) |
| 🐉 Pocket Dragon | Add a small green dragon with spread wings, standing on top of the phone. | 39.2 dB | 95.8% (lossless) |
| 🛸 Mothership | Add a colossal dark alien mothership with glowing blue lights, hovering in the sky above the city skyline. | 25.8 dB | 93.6% (lossless) |
| ☄️ Meteor Strike | Add a flaming meteor with a bright fiery trail and smoke, crashing onto the road in the distance. | 23.8 dB | 96.1% (lossless) |
| 🌀 Sky Portal | Add a swirling glowing blue portal with violet sparks at its edge, opening in the sky between the buildings. | 24.8 dB | 86.3% (lossless) |
| 🌊 Sea Serpent | Add a giant green sea monster head with a long neck, rising from the lake in the center. | 30.9 dB | 95.2% (lossless) |
| 🦌 Spirit Deer | Add a glowing blue spirit deer with shining antlers, standing on the forest path in the center. | 25.2 dB | 93.4% (lossless) |
| 💥 Road Explosion | Add a huge orange fireball explosion with smoke, on the road behind the car. | 36.6 dB | 90.1% (lossless) |
| 🪐 Desk Hologram | Add a small glowing blue hologram of a rotating planet, floating above the open book. | 32.6 dB | 91.5% (lossless) |
Average: 92.3% of every frame bit-identical to the source; raw model output outside the effect: 23.8–39.2 dB PSNR.
your shot ──► Prep Plate ──► LTX-2.3 EditAnything (open weights, IC-LoRA) ──► generated proxy
│ (8n+1 frames, │
│ 1024×576 proxy) ▼
│ Tone-align: robust per-frame colour fit
│ undoes the model's global drift
│ │
│ Difference Matte: noise-adaptive change
│ detection + 3-D (space+time) hysteresis
│ │
│ Temporal Stabilize: median + bidirectional
│ agreement (no flicker, no ghost trails)
│ │
└──────────────────────────────► Composite onto Plate: effect upscaled, re-grained,
laid over the FULL-RES original; zero-matte pixels copied
bit-exact ──► comp · X-ray · VFX element · 9:16 share · report
| Node | What it does |
|---|---|
| PlateLock · Prep Plate | Trims to LTX's 8n+1 frame rule and makes a /32 model-resolution proxy |
| PlateLock · Difference Matte | Finds what the model added. Robust tone fit (reduced-major-axis regression, immune to sensor-noise bias) → opponent-colour distance → per-frame noise-floor normalisation → 3-D geodesic hysteresis so weak responses survive only if connected in space or time to a strong one |
| PlateLock · Temporal Stabilize | Temporal median + forward/backward EMA, keeping only what both directions agree on — damps flicker without smearing fast effects |
| PlateLock · Refine Matte | Open / close / grow / feather |
| PlateLock · Composite onto Plate | Upscales the effect, re-grains it with the plate's measured noise, composites onto the full-res original; zero-matte pixels are copied bit-exact |
| PlateLock · Extract VFX Element | alpha (premultiplied, comp over) or emissive (light the model added, comp screen/add) |
| PlateLock · Fidelity Report | Measures untouched %, bit-identical %, PSNR outside the effect for raw model vs PlateLock; saves JSON |
| PlateLock · X-Ray Overlay | Shows exactly where the model was allowed to touch your shot |
| PlateLock · Before/After Share | Animated wipe, reframed 9:16 / 1:1 / 4:5 with blurred fill — made for Reels/TikTok/Shorts |
| PlateLock · Gamma | Tiny replacement for the gamma pair the EditAnything template needs (drops a heavy dependency) |
| PlateLock 🔒 Lock Plate | All-in-one: matte → stabilise → refine → composite |
The nodes are pure PyTorch (CUDA / MPS / CPU), have no dependencies beyond ComfyUI, and work with any
video-to-video model's output — not just LTX. They're unit-tested on synthetic shots with known ground truth
(comfyui-platelock/tests).
A FastAPI + vanilla-JS studio that talks to ComfyUI only through the Comfy Developer Platform
(comfy-sdk → comfy-api-proxy → self-hosted ComfyUI, or Comfy Cloud):
- Add an effect — drop a clip, tap a preset (🔮 Energy Orb, 🔥 Set It Ablaze, 🐉 Pocket Dragon, 🛸 Mothership…) or write your own
- Lock any generation — bring the original + any AI-edited version (from any tool) and PlateLock rescues your plate
- Compare viewer — frame-locked split slider, zoom, Original / Raw LTX / PlateLock / X-Ray / Element
- Fidelity panel — the numbers, per shot
- Exports — final comp, 9:16 share clip, VFX element, X-ray matte
1 · GPU box (we used a Runpod L40S 48 GB; a 24 GB card works with offloading):
git clone https://github.com/TusharTechs/platelock && cd platelock
bash scripts/runpod_setup.sh # ComfyUI + LTXVideo nodes + PlateLock nodes + 44 GB of open weights + comfy-api-proxyModels (all open weights): ltx-2.3-22b-distilled-fp8 (Lightricks), gemma_3_12B_it_fp8_scaled,
ltx23_edit_anything IC-LoRA (Alissonerdx).
2 · The app (anywhere — your laptop is fine):
ssh -N -L 8189:127.0.0.1:8189 root@<gpu-host> -p <port> # or run the app on the GPU box
export COMFY_BASE_URL=http://127.0.0.1:8189
pip install -r app/requirements.txt
python app/run.py # → http://127.0.0.1:7860Just the nodes: copy/symlink comfyui-platelock into ComfyUI/custom_nodes, open
workflows/platelock_ltx_api.json (full pipeline) or workflows/platelock_comp_api.json (bring your own
generation).
Static gallery: app/web + examples/ deploy as-is to GitHub Pages.
- "Bit-identical" refers to PlateLock's output frames vs the decoded original. Delivery encodes (H.264 in the app) are lossy as always; export losslessly if you need it end-to-end.
- The difference matte keeps anything the model changed — including legitimate secondary effects like light spill and shadows (good), and occasional unwanted model edits (use Lock tightness or a region hint).
- EditAnything is an experimental community LoRA; some prompts don't take. PlateLock can't add what the model didn't generate — it guarantees it doesn't take away what you shot.
LTX-2.3 by Lightricks · EditAnything IC-LoRA by Alissonerdx · ComfyUI by Comfy Org · sample footage from
Mixkit (free license; unmodified source clips are not redistributed here — scripts/fetch_footage.sh downloads them) · demo music "Deep Techno Ambience" and sound effects from Mixkit (free license — scripts/fetch_audio.sh) · demo narration by Kokoro-82M (open weights) · logo in brand/.
MIT © 2026